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<div class="d-none d-xl-block col-xl-2 bd-toc">
  <ul class="section-nav">
    <li class="toc-entry toc-h2"><a href="#responsive-images">响应式图片</a>
      <ul>
        <li class="toc-entry toc-h4"><a href="#svg-images-and-ie-10">IE 10问题以及SVG图形的特殊处理</a></li>
      </ul>
    </li>
    <li class="toc-entry toc-h2"><a href="#image-thumbnails">缩略图处理</a></li>
    <li class="toc-entry toc-h2"><a href="#aligning-images">图像对齐处理</a></li>
    <li class="toc-entry toc-h2"><a href="#picture">Html 5 标准之Picture元素</a></li>
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</div>
<main class="col-12 col-md-9 col-xl-8 py-md-3 pl-md-5 bd-content" role="main">
  <h1 class="bd-title" id="content">图片</h1>
  <p class="bd-lead">BootStrap图片处理的示例和文档，由于我们为图片添加了轻量级的无干扰样式和响应式行为，因此在BootStrap设计中引用图片可以更加方便且不会轻易撑破其它元素。</p>
   
  <h2 id="responsive-images">响应式图片</h2>
  <p>
  在Bootstrap中，给图片添加<code class="highlighter-rouge">.img-fluid</code>样式，或定义<code class="highlighter-rouge">max-width: 100%</code>、<code class="highlighter-rouge">height:auto;</code>样式，即可赋得响应式特性，图片大小会随着父元素大小同步缩放。</p>
 <div class="bd-example">
  <svg class="bd-placeholder-img bd-placeholder-img-lg img-fluid" width="100%" height="250" xmlns="http://www.w3.org/2000/svg" preserveAspectRatio="xMidYMid slice" focusable="false" role="img" aria-label="Placeholder: Responsive image"><title>Placeholder</title><rect width="100%" height="100%" fill="#868e96"></rect><text x="50%" y="50%" fill="#dee2e6" dy=".3em">Responsive image</text></svg>
</div>
  <figure class="highlight">
    <pre><code class="language-html" data-lang="html"><span class="nt">&lt;img</span> <span class="na">src=</span><span class="s">"..."</span> <span class="na">class=</span><span class="s">"img-fluid"</span> <span class="na">alt=</span><span class="s">"Responsive image"</span><span class="nt">&gt;</span></code></pre>
  </figure>
  <div class="bd-callout bd-callout-warning">
    <h4 id="svg-images-and-ie-10">IE 10问题以及SVG图形的特殊处理</h4>
    <p>在IE 10浏览器中，带<code class="highlighter-rouge">.img-responsive</code>类的SVG图片尺寸可能会不均称，这是一个浏览器级的缺陷，你可以在相应图片元素上添加<code class="highlighter-rouge">width: 100% \9</code>来解决它（<code class="highlighter-rouge">width:100% \9</code>方法不能普遍引用，否则会造成其它图片格式的混乱，所以Bootstrap没有全局自动引用之）。</p>
  </div>
  <h2 id="image-thumbnails">缩略图处理</h2>
  <p>您可以使用<code class="highlighter-rouge">.img-thumbnail</code>属性来使图片自动被加上一个带圆角且1px边界的外框缩略图样式（你也可以使用系统提供的边隙间距方法，如<code class="highlighter-rouge">.p-1</code>再加上边框颜色定义达成），效果如下：</p>
<div class="bd-example bd-example-images">
  <svg class="bd-placeholder-img img-thumbnail" width="200" height="200" xmlns="http://www.w3.org/2000/svg" preserveAspectRatio="xMidYMid slice" focusable="false" role="img" aria-label="A generic square placeholder image with a white border around it, making it resemble a photograph taken with an old instant camera: 200x200"><title>A generic square placeholder image with a white border around it, making it resemble a photograph taken with an old instant camera</title><rect width="100%" height="100%" fill="#868e96"></rect><text x="50%" y="50%" fill="#dee2e6" dy=".3em">200x200</text></svg>
</div>
  <figure class="highlight">
    <pre><code class="language-html" data-lang="html"><span class="nt">&lt;img</span> <span class="na">src=</span><span class="s">"..."</span> <span class="na">alt=</span><span class="s">"..."</span> <span class="na">class=</span><span class="s">"img-thumbnail"</span><span class="nt">&gt;</span></code></pre>
  </figure>
  <h2 id="aligning-images">图像对齐处理</h2>
  <p>对于<code class="highlighter-rouge">.block</code>属性的块状图片，我们也可以使用 <a href="https://code.z01.com/docs/4.0/utilities/float">浮动定义规范</a> 或 <a href="https://code.z01.com/docs/4.0/utilities/text/#text-alignment">文字对齐规范</a>，来实现对图像的对齐、浮动控制，带<code class="highlighter-rouge">.block</code>块属性的图片，可以自动获得 <code class="highlighter-rouge">.mx-auto</code> 的位置对齐属性</a>.</p>
<div class="bd-example bd-example-images">
  <svg class="bd-placeholder-img rounded float-left" width="200" height="200" xmlns="http://www.w3.org/2000/svg" preserveAspectRatio="xMidYMid slice" focusable="false" role="img" aria-label="Placeholder: 200x200"><title>Placeholder</title><rect width="100%" height="100%" fill="#868e96"></rect><text x="50%" y="50%" fill="#dee2e6" dy=".3em">200x200</text></svg>
  <svg class="bd-placeholder-img rounded float-right" width="200" height="200" xmlns="http://www.w3.org/2000/svg" preserveAspectRatio="xMidYMid slice" focusable="false" role="img" aria-label="Placeholder: 200x200"><title>Placeholder</title><rect width="100%" height="100%" fill="#868e96"></rect><text x="50%" y="50%" fill="#dee2e6" dy=".3em">200x200</text></svg>
</div>
  <figure class="highlight">
    <pre><code class="language-html" data-lang="html"><span class="nt">&lt;img</span> <span class="na">src=</span><span class="s">"..."</span> <span class="na">class=</span><span class="s">"rounded float-left"</span> <span class="na">alt=</span><span class="s">"..."</span><span class="nt">&gt;</span>
<span class="nt">&lt;img</span> <span class="na">src=</span><span class="s">"..."</span> <span class="na">class=</span><span class="s">"rounded float-right"</span> <span class="na">alt=</span><span class="s">"..."</span><span class="nt">&gt;</span></code></pre>
  </figure>
<div class="bd-example bd-example-images">
  <svg class="bd-placeholder-img rounded mx-auto d-block" width="200" height="200" xmlns="http://www.w3.org/2000/svg" preserveAspectRatio="xMidYMid slice" focusable="false" role="img" aria-label="Placeholder: 200x200"><title>Placeholder</title><rect width="100%" height="100%" fill="#868e96"></rect><text x="50%" y="50%" fill="#dee2e6" dy=".3em">200x200</text></svg>
</div>
  <figure class="highlight">
    <pre><code class="language-html" data-lang="html"><span class="nt">&lt;img</span> <span class="na">src=</span><span class="s">"..."</span> <span class="na">class=</span><span class="s">"rounded mx-auto d-block"</span> <span class="na">alt=</span><span class="s">"..."</span><span class="nt">&gt;</span></code></pre>
  </figure>
<div class="bd-example bd-example-images">
  <div class="text-center">
    <svg class="bd-placeholder-img rounded" width="200" height="200" xmlns="http://www.w3.org/2000/svg" preserveAspectRatio="xMidYMid slice" focusable="false" role="img" aria-label="Placeholder: 200x200"><title>Placeholder</title><rect width="100%" height="100%" fill="#868e96"></rect><text x="50%" y="50%" fill="#dee2e6" dy=".3em">200x200</text></svg>
  </div>
</div>
  <figure class="highlight">
    <pre><code class="language-html" data-lang="html"><span class="nt">&lt;div</span> <span class="na">class=</span><span class="s">"text-center"</span><span class="nt">&gt;</span>
  <span class="nt">&lt;img</span> <span class="na">src=</span><span class="s">"..."</span> <span class="na">class=</span><span class="s">"rounded"</span> <span class="na">alt=</span><span class="s">"..."</span><span class="nt">&gt;</span>
<span class="nt">&lt;/div&gt;</span></code></pre>
  </figure>
  <h2 id="picture">Html 5 标准之Picture元素</h2>
  <p>HTML5标准提供了一个全新的<code class="highlighter-rouge">&lt;picture&gt;</code> 元素，它可以为 <code class="highlighter-rouge">&lt;img&gt;</code>指定多个<code class="highlighter-rouge">&lt;source&gt;</code> 定义，请确保在<code class="highlighter-rouge">&lt;img&gt;</code> 标签里使用使用<code class="highlighter-rouge">.img-*</code> CSS样式进行定义绑定，而不是仅仅认为引用了 <code class="highlighter-rouge">&lt;img&gt</code> 就达成了，如下第三行代码所示：</p>
  <figure class="highlight">
    <pre><code class="language-html" data-lang="html">​<span class="nt">&lt;picture&gt;</span>
  <span class="nt">&lt;source</span> <span class="na">srcset=</span><span class="s">"..."</span> <span class="na">type=</span><span class="s">"image/svg+xml"</span><span class="nt">&gt;</span>
  <span class="nt">&lt;img</span> <span class="na">src=</span><span class="s">"..."</span> <span class="na">class=</span><span class="s">"img-fluid img-thumbnail"</span> <span class="na">alt=</span><span class="s">"..."</span><span class="nt">&gt;</span>
<span class="nt">&lt;/picture&gt;</span></code></pre>
  </figure>
  <p>&lt;pictrue&gt;元素可实现图片在不同屏幕下的针对性响应式，其使用逻辑如下(译者补充)：</p>
    <figure class="highlight">
    <pre><code class="language-html" data-lang="html">​<span class="nt">&lt;picture&gt;</span>
  <span class="nt">&lt;source</span> <span class="na">srcset="大规格图片.jpg"  media="(min-width: 800px)"</span> <span class="nt">&gt;</span>
  <span class="nt">&lt;source</span> <span class="na">srcset="中规格图片.jpg"  media="(min-width: 600px)"</span><span class="nt">&gt;</span>
  <span class="nt">&lt;source</span> <span class="na">srcset="小规格图片.jpg"</span><span class="nt">&gt;</span>
  <span class="nt">&lt;img</span> <span class="na">src="通用图片.jpg"</span> <span class="na">alt=</span><span class="s">"这是当浏览器不支持picture标签时显示的图片"</span><span class="nt">&gt;</span>
<span class="nt">&lt;/picture&gt;</span></code></pre>
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